\documentclass{article}

\usepackage{multirow}

\begin{document}
\begin{tabular}{| l | l | c | c |}
	\hline
	\multicolumn{2}{|l|}{Header1} & Header2 & Header3 \\
	\hline
	\multicolumn{2}{|l|}{text11}  & text12  & text13  \\
	\hline
	\multicolumn{2}{|l|}{text21}  & text22  & text23  \\
	\hline
	\multirow{2}*{text31} & t311  & text312 & text313 \\
	                      & t312  & text322 & text323 \\
	\hline
\end{tabular}
\end{document}
